Patents by Inventor Tomoshi Tokunaga

Tomoshi Tokunaga has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7831984
    Abstract: A disk drive includes a disk rotating unit, a traverse base holding the disk rotating unit, a damper member holding the traverse base, a main unit holding the traverse base through the damper member, a tray mounting a cartridge housing the disk, a driving unit that loads or ejects the tray and moves the disk in the cartridge relative to the disk rotating unit, and a traverse base holding member that is moved vertically by the driving unit relative to the main unit at the time of tray loading or tray ejection. The traverse base is held by the traverse base holding member through the damper member, and the resonance frequencies of the damper member in the radius direction of the disk as it is being loaded and in the direction of a rotation shaft are set higher than the maximum rotational frequency of the disk.
    Type: Grant
    Filed: July 16, 2009
    Date of Patent: November 9, 2010
    Assignee: Panasonic Corporation
    Inventors: Shigeto Ueno, Teruyuki Naka, Shinichi Maeda, Masakazu Ishizuka, Yasuo Kabuta, Isao Obata, Tomoshi Tokunaga, Akira Yoshida
  • Publication number: 20100031278
    Abstract: A disk drive comprises a cartridge holding mechanism which has a small size and reduces a damper load. The disk drive comprises: a spindle motor 91 which mounts and rotates a disk; a traverse base 82 which holds the spindle motor 91; a rubber damper 71 which flexibly holds the traverse base 82; a mechanical chassis 60 which holds the traverse base 82 through the rubber damper 71; a tray 20 which mounts a cartridge 1 in which a disk is housed; and a loading motor 61 which moves the disk in the cartridge 1 close to the spindle motor 91 or away from the spindle motor 91. The cartridge 1 is supported by the mechanical chassis 60 through the tray 20.
    Type: Application
    Filed: July 16, 2009
    Publication date: February 4, 2010
    Applicant: PANASONIC CORPORATION
    Inventors: Shigeto UENO, Teruyuki Naka, Shinichi Maeda, Masakazu Ishizuka, Yasuo Kabuta, Isao Obata, Tomoshi Tokunaga, Akira Yoshida
  • Patent number: 7581233
    Abstract: A disk drive includes a cartridge holding mechanism which has a small size and reduces a damper load. The disk drive includes a spindle motor which mounts and rotates a disk. A traverse base holds the spindle motor, and a rubber damper flexibly holds the traverse base. A mechanical chassis holds the traverse base through the rubber damper, and a tray mounts a cartridge in which a disk is housed. A loading motor moves the disk in the cartridge close to the spindle motor or away from the spindle motor. The cartridge is supported by the mechanical chassis through the tray.
    Type: Grant
    Filed: January 7, 2003
    Date of Patent: August 25, 2009
    Assignee: Panasonic Corporation
    Inventors: Shigeto Ueno, Teruyuki Naka, Shinichi Maeda, Masakazu Ishizuka, Yasuo Kabuta, Isao Obata, Tomoshi Tokunaga, Akira Yoshida
  • Patent number: 7526780
    Abstract: A disc apparatus for recording or reading data to or from a disc includes a tray having a table on which the disc is placed and a shielding member that covers the tray. The shielding member has a circular opening and a plurality of arc protruding members. Each arc protruding member is provided on an inner surface of the shielding member that covers the tray as protruding towards an upper surface of the disc placed on the table of the tray. An end of each arc protruding member is situated near the opening. Each arc protruding member has a protruding end with a height ranging from 1.0 mm to 1.5 mm from the inner surface of the shielding member.
    Type: Grant
    Filed: April 11, 2006
    Date of Patent: April 28, 2009
    Assignee: Victor Company of Japan, Ltd.
    Inventor: Tomoshi Tokunaga
  • Patent number: 7299480
    Abstract: A disc drive apparatus includes a tray member, on which a bare disc, or a cartridge accommodating a disc therein is placed, and a disc drive device, into or from which the tray member is loaded or ejected by a drive unit. A medium detection system includes detection holes provided on the tray member to detect a disc or a cartridge. In addition, provided on the disc drive device is a detection unit to optically detect a state including a type of a disc or a cartridge placed on the tray member based on whether the detection holes are shaded in the course of loading of the tray member.
    Type: Grant
    Filed: September 16, 2004
    Date of Patent: November 20, 2007
    Assignee: Victor Company of Japan, Limited
    Inventor: Tomoshi Tokunaga
  • Publication number: 20060259917
    Abstract: A disc apparatus for recording or reading data to or from a disc includes a tray having a table on which the disc is placed and a shielding member that covers the tray. The shielding member has a circular opening and a plurality of arc protruding members. Each arc protruding member is provided on an inner surface of the shielding member that covers the tray as protruding towards an upper surface of the disc placed on the table of the tray. An end of each arc protruding member is situated near the opening. Each arc protruding member has a protruding end with a height ranging from 1.0 mm to 1.5 mm from the inner surface of the shielding member.
    Type: Application
    Filed: April 11, 2006
    Publication date: November 16, 2006
    Inventor: Tomoshi Tokunaga
  • Publication number: 20050249101
    Abstract: The driving state in a loading path is controlled in accordance with a loading operation of a placing member on which a disc-like medium is placed. According to a disc loading apparatus, a placing member on which a disc-like medium is placed is loaded or ejected into or from a disc loading device by a drive unit. The disc loading apparatus comprises a position detection unit which optically detects a position of the placing member in a region of movement concerting at least a portion of the loading path, and a drive profile control unit which changes a drive profile of a drive unit based on a position detection signal from the position detection unit.
    Type: Application
    Filed: April 28, 2005
    Publication date: November 10, 2005
    Inventor: Tomoshi Tokunaga
  • Publication number: 20050204373
    Abstract: A disk drive comprises a cartridge holding mechanism which has a small size and reduces a damper load. The disk drive comprises: a spindle motor 91 which mounts and rotates a disk; a traverse base 82 which holds the spindle motor 91; a rubber damper 71 which flexibly holds the traverse base 82; a mechanical chassis 60 which holds the traverse base 82 through the rubber damper 71; a tray 20 which mounts a cartridge 1 in which a disk is housed; and a loading motor 61 which moves the disk in the cartridge 1 close to the spindle motor 91 or away from the spindle motor 91. The cartridge 1 is supported by the mechanical chassis 60 through the tray 20.
    Type: Application
    Filed: January 7, 2003
    Publication date: September 15, 2005
    Applicant: Matsushita Electric Industrial Co., Ltd
    Inventors: Shigeto Ueno, Teruyuki Naka, Shinichi Maeda, Masakazu Ishizuka, Yasuo Kabuta, Isao Obata, tomoshi Tokunaga, Akira Yoshida
  • Publication number: 20050066341
    Abstract: A disc drive apparatus includes a tray member, on which a bare disc, or a cartridge accommodating a disc therein is placed, and a disc drive device, into or from which the tray member is loaded or ejected by a drive unit. A medium detection system includes detection holes provided on the tray member to detect a disc or a cartridge. In addition, provided on the disc drive device is a detection unit to optically detect a state including a type of a disc or a cartridge placed on the tray member based on whether the detection holes are shaded in the course of loading of the tray member.
    Type: Application
    Filed: September 16, 2004
    Publication date: March 24, 2005
    Inventor: Tomoshi Tokunaga